<!--
 * @Author: LBH 1336709799@qq.com
 * @Date: 2024-11-10 22:12:43
 * @LastEditors: LBH 1336709799@qq.com
 * @LastEditTime: 2024-11-10 22:14:49
 * @FilePath: \Day02\vuepractice\买点书.html
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
-->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <div id="app">
      <div>
        <p>请选择你要购买的书籍</p>
        <ul>
          <li v-for="(item, index) in arr" :key="index">
            {{item.name}} <button @click="buyBook(index)">买书</button>
          </li>
        </ul>
        <table border="1" width="500" cellspacing="0">
          <tr>
            <th>序号</th>
            <th>书名</th>
            <th>单价</th>
            <th>数量</th>
            <th>合计</th>
          </tr>
          <tr v-for="(item, index) in arr" :key="index">
            <th>{{index}}</th>
            <th>{{item.name}}</th>
            <th>{{item.price}}</th>
            <th>{{item.count}}</th>
            <th>{{item.price * item.count}}</th>
          </tr>
        </table>
        <p>总价格为: {{totalPrice}}</p>
      </div>
    </div>
    <script src="./vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          arr: [
            {
              name: "水浒传",
              price: 107,
              count: 0,
            },
            {
              name: "西游记",
              price: 192,
              count: 0,
            },
            {
              name: "三国演义",
              price: 219,
              count: 0,
            },
            {
              name: "红楼梦",
              price: 178,
              count: 0,
            },
          ],
        },
        methods: {
          buyBook(id) {
            this.arr[id].count++;
          },
        },
        computed: {
          totalPrice() {
            return this.arr.reduce(
              (sum, item) => sum + item.price * item.count,
              0
            );
          },
        },
      });
    </script>
  </body>
</html>
